Fitness device



FIG. 1 is a perspective view of a fitness device showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a back view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a top view thereof;

FIG. 7 is a bottom view thereof; and,

FIG. 8 is another perspective view thereof.

The broken lines shown in the figures are for the purpose of illustrating portions of the fitness device, which form no part of the claimed design. 

CLAIM The ornamental design for a fitness device, as shown and described. 